alt Hacker NewsGood, but mass adoption is a lot slower in sites than in browsers it seems. It's like pulling teeth making sites to actually support even AVIF which is already widely supported in browsers. A ton of inertia even on sites like GitHub and GitLab. Try using AVIF on Wikipedia? Tough luck.
Imagine how long it will take for JPEG XL that didn't even reach wide browsers support yet.
Side note - comparing JPEG XL and AVIF features wise is sort of pointless if AVIF will continue to evolve based on AV2 and etc.
There’s also the issue of non-browser support. I recently advocated for replacing some GIFs with WEBM because WEBM was faster to encode and took up 3% as much space. Technically it sounded great. Then we talked to users.
It turns out some users wanted to embed moving pictures in Word documents, which you can only do with a GIF because it’s an image format that happens to move, so Word treats it as an image (by rendering it to the page). If it’s a video format, Word treats it as an attachment that you have to click on so it’ll open Media Player and show you.